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Car Forum / Pontiac / Pontiac Firebird / June 2005

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Question about wheels and lowering 1995 Z28

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qhorque@yahoo.com - 17 Jun 2005 22:46 GMT
Hi,

I have a '95 Z28 which I have recently done some suspension mods.  I
used an Eibach lowering kit to lower it 1.3 inches along with some KYB
shocks and new swaybar, etc.  I did not include an extra set of bump
stop springs.  I also have a set of Enkei "Win" wheels with some BF
Goodrich rubber.  The wheels are 9.5 inches wide with the proper tires.

The problems I am having are that the setup definitely makes the car
flat in tight turns and it is much more responsive but the springs,
while stiffer than stock, do not prevent the car from bottoming out
more frequently as well as allowing the rear tires to scrape the inside
edge of the wheel well.

Usually when I am driving slow it's not a problem but there have been
several spots where, if I am going too fast, the car bottoms out and
the tires scrape.  Also, exiting out of parking lots where the
transition between the slope down from the lot to the slope up to the
street causes the back end to drop hard.

The questions are is this normal for the Eibach springs to allow the
back end to drop so hard.  Would this be prevented by adding bump stops
or would that just cause the back end to slam hard against the inner
springs?  Are the KYB shocks to blame?  Was 1.3 inches too much?  Do I
need to narrow up the wheels back to the stock rims and if so, what
will that do to the handling now?

So far, the right rear tire is the victim and it's getting kind of
ragged along the outer edge though it doesn't appear to be degrading
the safety nor cutting into the "meat" of the rubber.  The left rear
doesn't seem to have the same issue which is odd.  Also my tailpipes
are scraping and the left side has already broken it's bracket which
was welded to the frame.

Should I raise it back up in the back only or will that throw off the
balance if the front remains 1.3 inches lower?  I wouldn't feel too bad
if I had to go back to stock rims so they fit inside the wheel well but
I don't want to sacrifice my new better handling.

Thanks for the help,

Bob
FBR - 17 Jun 2005 23:30 GMT
> Hi,
>
[quoted text clipped - 39 lines]
>
> Bob

One thing you can do to minimize bottoming out it to brake BEFORE you need
to, then let off the brakes to let the suspension have full travel when you
hit the speedbump or whatever.  Other than that it's a matter of dealing
with the suspension choices you've made.
Cy Welch - 17 Jun 2005 23:40 GMT
> Hi,
>
[quoted text clipped - 38 lines]
>
> Bob

My understanding (and I am no expert by any means) from lots of reading
and study of automotive modification and such is that Stock 3rd and 4th
gen Camaro's tend to be about as low as is practical for normal road use
in stock form.  Lowering like you have done, while helpful for handling,
tends to leave you with a problem with irregularities in the driving
surface.  While true race cars are very low, they are designed to run on
VERY flat surfaces, and for the most part (except maybe for F1) don't do
well on normal roads.  I know my 89 has trouble at stock height with
parking lot entrances and such, I can't see how I would be able to drive
it much of anywhere on normal roads if I were to lower it 1.3 inches.
You may need to make a choice between handling and beating your car to
death, or go with an air ride so you can adjust it for the type of
surfaces your driving on.

Signature

Cy Welch
Senior Programmer
MetSYS Inc
http://www.metsysinc.com

qhorque@yahoo.com - 23 Jun 2005 21:14 GMT
Hmmm, not sure if that's really the case here but it's possible.  I
generally only have troubles going over speedbumps in parking lots
where the front wheels go over and the bouncing action causes the
transmission to jounce on the bump.  A bit disconcerting to say the
least.  Otherwise, the car is fine except for the wheel well scraping
and the rather excessive bottoming as noted before.

I think what I am experiencing is an issue with the springs just not
being stiff enough which is odd since the kit was for my model.  After
all, if you check out a lower car such as a Corvette, they are much
closer to the ground, have less wheel/well clearance and generally
don't have the issues I have though they have slightly different
geometry and obviously different springs.

I think I'll repost to Brent Franker since I believe his car has the
same components as I do (I just realized this after reviewing his
webpage again..)

Thanks for the input!

Bob
RSCamaro - 23 Jun 2005 23:15 GMT
>Hmmm, not sure if that's really the case here but it's possible.  I
>generally only have troubles going over speedbumps in parking lots
>where the front wheels go over and the bouncing action causes the
>transmission to jounce on the bump.  A bit disconcerting to say the
>least.  Otherwise, the car is fine except for the wheel well scraping
>and the rather excessive bottoming as noted before.

The answer you are looking for is to just go across the speed bumps at
an angle.  This way you don't have the weight of the whole car coming
down at one time.  I've had similar problems with  a 68' Camaro, a 78'
Camaro, and a couple of early 70's Chevelles that I've owned over
time.

                              ...Ron

>I think what I am experiencing is an issue with the springs just not
>being stiff enough which is odd since the kit was for my model.  After
[quoted text clipped - 10 lines]
>
>Bob

--
68' Camaro RS
88' Firebird Formula
00' Mustang GT Vert
 
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